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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e081a119074585b8b35fac9ac0b492e1f30c9910aec40d78da69a8f4fbfd0f4c' 
  AND token = '50Lq1ujVjYv/9BKw4Vi6y/W9nDJvfpoafXdw7P2zKD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}